Mountain Bike Frame Geometry
February 5, 2009 by Keith Scott
Filed under Frames
When designing any basic hardtail mountain bike there are several important geometric aspects to consider. As soon as a decision is made to design a bike with rear suspension, then a number of dynamic factors must also be considered. The relevance and importance of the dynamic constraints becomes even more crucial as the amount of rear wheel travel increases to the amount required to compete in the extreme-freeride and downhill race markets.
The most important parameters such as lengths and angles considered during basic frame design are shown in Figure 5.
The dimensions of the front triangle on a well designed frame should be governed by the geometry of human bodies, and designed to be ergonomic in order to provide comfort and control. As a result most bikes are designed in three or more different sizes to suit people of all shapes and sizes.
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This post was written by:
Keith Scott - who has written 3 posts on Mountain bike product reviews, bike builds, trail reviews, forum, and tips – MTOBikes.com.
Keith Scott is the design engineer for Banshee Bikes. He resides in Scotland where he enjoys all day epic rides in the highlands and the French Alps. He is a graduate of Durham located in the UK where he received a masters in mechanical engineering and specialized in suspension frame and linkage design.
[...] Mountain Bike Frame Geometry [...]
I have a Specialized pitch pro that I built up. my fork goes from 85mm to 130mm the pitch comes with a 140mm fork. I am looking at buying a Specialized Enduro frame but the enduro comes with a 150mm fork do you think I could ride it with a 130mm fork? At the moment my pitch rides fine but not sure if it will be pushing it with the frame of the enduro. thanks for your help.